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