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