\documentclass[12pt,a4paper]{article}
\usepackage[francais]{babel}
\usepackage{mafr}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{lmodern}
\usepackage[dvipsnames]{xcolor}
\usepackage{pstricks}
\begin{document}
\begin{pspicture}(-3,-3)(3,3)%
\psgrid[subgriddiv=1,gridcolor=lightgray,griddots=10,gridlabelcolor=cyan]%
	   (0,0)(-3,-3)(3,3)%
\end{pspicture}
\end{document}
