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