\documentclass[12pt]{article}
\setlength{\unitlength}{1mm}
\usepackage[pdftex]{color}
\usepackage[paperwidth=105\unitlength,paperheight=105\unitlength]{geometry}
\setlength{\topmargin}{-36mm}
\setlength{\textwidth}{105\unitlength}
\setlength{\textheight}{105\unitlength}
\setlength{\oddsidemargin}{-23mm}
\setlength{\parindent}{0cm}
\pagestyle{empty}
\definecolor{fEqcA}     {rgb}{0.99,0.00,0.00}
\definecolor{fEqcB}     {rgb}{0.00,0.99,0.00}
\definecolor{fEqcC}     {rgb}{0.00,0.00,0.99}
\definecolor{fEqcD}     {rgb}{0.99,0.99,0.00}
\definecolor{fEqcE}     {rgb}{0.00,0.99,0.99}
\definecolor{bEqcA}     {rgb}{0.99,0.50,0.50}
\definecolor{bEqcB}     {rgb}{0.50,0.99,0.50}
\definecolor{bEqcC}     {rgb}{0.50,0.50,0.99}
\definecolor{bEqcD}     {rgb}{0.99,0.99,0.50}
\definecolor{bEqcE}     {rgb}{0.50,0.99,0.99}
\definecolor{bDomXr}    {rgb}{0.85,0.85,0.85}
\definecolor{bDomXi}    {rgb}{0.97,0.97,0.97}

\begin{document}
\begin{picture}(100,100)
% dom,ran split
\textcolor{bDomXr}{\put(10,90){\makebox(0,0)[tl]{\rule{90mm}{60mm}}}}%
\textcolor{bDomXi}{\put(10,30){\makebox(0,0)[tl]{\rule{90mm}{30mm}}}}%
% equaivalence class backgrounds in X_r
\textcolor{fEqcA}{\put(10,90){\makebox(0,0)[tl]{\rule{20mm}{20mm}}}}%
\textcolor{fEqcB}{\put(30,70){\makebox(0,0)[tl]{\rule{10mm}{10mm}}}}%
\textcolor{fEqcC}{\put(40,60){\makebox(0,0)[tl]{\rule{10mm}{10mm}}}}%
\textcolor{fEqcD}{\put(50,50){\makebox(0,0)[tl]{\rule{15mm}{15mm}}}}%
\textcolor{fEqcE}{\put(65,35){\makebox(0,0)[tl]{\rule{05mm}{05mm}}}}%
% equaivalence class echo backgrounds in X_i
\textcolor{bEqcA}{\put(70,90){\makebox(0,0)[tl]{\rule{06mm}{20mm}}}}%
\textcolor{bEqcB}{\put(76,70){\makebox(0,0)[tl]{\rule{06mm}{10mm}}}}%
\textcolor{bEqcC}{\put(82,60){\makebox(0,0)[tl]{\rule{06mm}{10mm}}}}%
\textcolor{bEqcD}{\put(88,50){\makebox(0,0)[tl]{\rule{06mm}{15mm}}}}%
\textcolor{bEqcE}{\put(94,35){\makebox(0,0)[tl]{\rule{06mm}{05mm}}}}%
\thicklines%
% outer frame
\put(10,90){\line(1,0){90}}%
\put(10,0){\line(1,0){90}}%
\put(10,0){\line(0,1){90}}%
\put(100,0){\line(0,1){90}}%
% separation X_r,X_i
\put(70,0){\line(0,1){90}}%
\put(10,30){\line(1,0){90}}%
% reflexive diagonal in X_r
\put(10,90){\line(1,-1){60}}%
% equivalence class 1,2 in X_r
\put(10,70){\line(1,0){30}}%
\put(30,90){\line(0,-1){30}}%
% equivalence class 2,3 in X_r
\put(30,60){\line(1,0){20}}%
\put(40,70){\line(0,-1){20}}%
% equivalence class 3,4 in X_r
\put(40,50){\line(1,0){25}}%
\put(50,60){\line(0,-1){25}}%
% equivalence class 4,5 in X_r
\put(50,35){\line(1,0){20}}%
\put(65,50){\line(0,-1){20}}%
% equivalence class 1,2 echo in X_i
\put(70,70){\line(1,0){12}}
\put(76,90){\line(0,-1){30}}
% equivalence class 2,3 echo in X_i
\put(76,60){\line(1,0){12}}
\put(82,70){\line(0,-1){20}}
% equivalence class 3,4 echo in X_i
\put(82,50){\line(1,0){12}}
\put(88,60){\line(0,-1){25}}
% equivalence class 4,5 echo in X_i
\put(88,35){\line(1,0){12}}
\put(94,50){\line(0,-1){20}}
% captions X_r, X_i
\put(5,60){\makebox(0,0){dom}}
\put(5,15){\makebox(0,0){\it rest}}
\put(40,95){\makebox(0,0){dom}}
\put(85,95){\makebox(0,0){\it rest}}
% captions row,col = x,y
\put(0,100){\makebox(0,0)[tl]{$xRy$}}
\put(5,87){\makebox(0,0)[t]{$x$}}
\put(13,95){\makebox(0,0)[l]{$y$}}
\put(5,85){\vector(0,-1){5}}
\put(15,95){\vector(1,0){5}}
\end{picture}
\end{document}