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