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)(11,22)(12,16)(13,17)(14,31)(15,32)(18,25)(19,28)(20,27)(21,29)(23,38)(24,37)(26,36)(30,34)(33,35)(39,40) involution — undirected(2,5)(6,8)(10,16)(17,20)(18,34)(19,31)(21,32)(22,38)(35,36)(37,39) involution — undirected(1,3,4,7)(2,6,5,8)(10,17)(13,28)(14,27)(15,29)(16,20)(18,35)(19,21)(22,37)(24,25)(26,33)(30,40)(31,32)(34,36)(38,39)(9,11)(10,18)(12,23)(13,30)(14,24)(15,33)(16,34)(17,35)(19,38)(20,36)(21,39)(22,31)(25,27)(26,29)(28,40)(32,37) 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.