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