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