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