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