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