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