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