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