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