I constructed a graph "gamma" with 1170 vertices, which is the Sp(4,8)-graph with
1-subspaces and isotropic 2-subspaces as its vertices and (a,b) is an edge iff
IsSubspace(b,a) or IsSubspace(a,b). But when I calculate 'AutGroupGraph(gamma)',
GAP showed that "n can't be less than 1 or more than 1024", and followed with many
many error messages. I guess "n" is the number of the vertices of the graph. However,
how can I get this automorphism group of the graph?