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