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