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