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)(17,18,22,23)(19,24,21,20)(25,26)(27,33)(28,30)(29,32)(31,35)(34,39)(36,37)(38,40)(9,11)(10,14)(12,15)(13,16)(17,19,22,21)(18,20,23,24)(26,28)(31,33)(32,36)(38,39)(17,20)(18,19)(21,23)(22,24)(25,27,30,35)(26,31,28,33)(29,34,37,40)(32,38,36,39)(1,2)(3,6)(4,5)(7,8)(9,12,13,10)(11,15,16,14)(17,21,22,19)(18,20,23,24)(25,28,30,26)(27,33,35,31)(29,32,37,36)(34,38,40,39)(1,3,4,7)(2,6,5,8)(9,11)(10,15)(12,14)(13,16)(17,20)(18,21)(19,23)(22,24)(25,29)(26,32)(27,34)(28,36)(30,37)(31,38)(33,39)(35,40)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.