I'm just trying to input an adjacency matrix without involving any group action, and apparently I need to define a trivial symmetric group on N letters. Or maybe not. In any case this gives me an error:
RequirePackage("grape");
G := TrivialGroup(3);
A := [[0,1,0],[0,0,1],[1,0,0]];
Graph( G, [1..3], OnPoints, function(x,y) return A[x][y]=1; end,
true );
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