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