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