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