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