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