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