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