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