One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,13)(12,14)(15,16)(17,18,21,23)(19,24,28,38)(20,30,32,25)(22,26,34,37)(27,43,44,39)(29,35,41,47)(31,45,48,40)(33,46,42,36)(2,5)(6,8)(9,11,12,15)(10,13,14,16)(17,19)(18,24)(20,31)(21,28)(22,35)(23,38)(25,40)(26,41)(27,33)(29,37)(30,45)(32,48)(34,47)(36,39)(42,44)(43,46)(1,3,4,7)(2,6,5,8)(10,14)(13,16)(17,20,21,32)(18,25,23,30)(19,27,28,44)(22,36,34,46)(24,39,38,43)(26,42,37,33)(29,45,41,40)(31,47,48,35)(2,5)(6,8)(17,18,21,23)(19,24,28,38)(20,25,32,30)(22,26,34,37)(27,39,44,43)(29,35,41,47)(31,40,48,45)(33,36,42,46)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.