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