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