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