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