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