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