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