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