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