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