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