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