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