One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,14)(12,19)(13,15)(16,20)(17,23)(18,21)(22,24)(26,30)(28,36)(31,33)(34,37) involution — undirected(1,2)(3,7)(4,6)(5,8)(9,11,13,18)(10,14,15,21)(12,17,20,24)(16,22,19,23)(25,26,29,30)(27,33,35,31)(28,32,36,38)(34,40,37,39)(1,3)(2,5)(4,8)(6,7)(10,15)(14,21)(16,19)(22,23)(25,26,29,30)(27,31,35,33)(28,32,36,38)(34,39,37,40)(2,6)(5,7)(9,10)(11,14)(12,16)(13,15)(17,22)(18,21)(19,20)(23,24)(25,26)(27,33)(28,32)(29,30)(31,35)(34,40)(36,38)(37,39) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,11)(10,14)(12,17)(13,18)(15,21)(16,22)(19,23)(20,24)(25,27,29,35)(26,31,30,33)(28,37,36,34)(32,40,38,39)(1,3)(2,7)(4,8)(5,6)(9,12)(10,16)(11,17)(13,20)(14,22)(15,19)(18,24)(21,23)(25,28)(26,32)(27,34)(29,36)(30,38)(31,39)(33,40)(35,37) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.