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