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