The McLaughlinGraph() command returns the McLaughlin graph, a strongly regular graph with 275 vertices and 15400 edges.

The automorphism group of the McLaughlin graph contains the McLaughlin group as a subgroup of index 2.

$\mathrm{with}\left(\mathrm{GraphTheory}\right)\:$

$\mathrm{with}\left(\mathrm{SpecialGraphs}\right)\:$

$G≔\mathrm{McLaughlinGraph}\left(\right)$

$G≔\mathrm{Graph\; 1:\; an\; undirected\; unweighted\; graph\; with\; 275\; vertices\; and\; 15400\; edge(s)}$

$\mathrm{IsStronglyRegular}\left(G\,\mathrm{parameters}\right)$

$\mathrm{true},\left[112\,30\,56\right]$

"McLaughlin graph", Wikipedia. http://en.wikipedia.org/wiki/McLaughlin_graph

The GraphTheory[SpecialGraphs][McLaughlinGraph] command was introduced in Maple 2020.

For more information on Maple 2020 changes, see Updates in Maple 2020.