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