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