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