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