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