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