One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(10,13)(11,15)(17,18,21,24)(19,22,23,20)(25,26)(27,31)(28,30)(29,32)(33,35)(34,38)(36,37)(39,40)(2,5)(6,8)(17,19)(18,22)(20,24)(21,23)(26,28)(27,33)(29,37)(38,40) involution — undirected(9,10,12,13)(11,14,15,16)(17,20,21,22)(18,23,24,19)(25,27,30,33)(26,31,28,35)(29,34,37,39)(32,38,36,40)(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,13)(15,16)(17,20)(18,19)(21,22)(23,24)(25,28,30,26)(27,31,33,35)(29,36,37,32)(34,38,39,40)(1,3)(2,6)(4,7)(5,8)(9,11)(10,14)(12,15)(13,16)(17,19)(18,20)(21,23)(22,24)(25,29)(26,32)(27,34)(28,36)(30,37)(31,38)(33,39)(35,40) 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.