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)(25,26,31,34)(27,32,30,28)(29,33,38,40)(35,39,37,36)(1,2)(3,7)(4,6)(5,8)(9,11,13,19)(10,14,16,17)(12,20,21,18)(15,23,24,22)(25,27,31,30)(26,32,34,28)(29,37,38,35)(33,36,40,39)(1,3)(2,5)(4,8)(6,7)(25,28,30,26,31,32,27,34)(29,36,37,33,38,39,35,40)(2,6)(3,8)(9,12,13,21)(10,15,16,24)(11,18,19,20)(14,22,17,23)(25,29,31,38)(26,33,34,40)(27,35,30,37)(28,36,32,39)(2,6)(5,7)(10,16)(14,17)(15,24)(22,23)(29,38)(33,40)(35,37)(36,39) 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.