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