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