Ok, finally, using dot2tex optional package + graphviz, I obtain tikz code
which compiles :
sage: m = matrix(3, range(9))
sage: m.set_immutable()
sage: G = Graph()
sage: G.add_vertex(m)
sage: tikz_string = G.latex_options().dot2tex_picture()
sage: print tikz_string
\begin{tikzpicture}[>=latex,line join=bevel,]
%%
\node (012345678) at (34bp,22bp) [draw,draw=none]
{$\left(\begin{array}{rrr}0 & 1 & 2 \\3 & 4 & 5 \\6 & 7 &
8\end{array}\right)$};
%
\end{tikzpicture}
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