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)(11,14)(12,15)(13,16)(17,18,21,25)(19,23,29,39)(20,31,33,24)(22,26,35,43)(27,45,47,37)(28,38,30,40)(32,48,46,41)(34,44,36,42)(2,5)(6,8)(9,11,13,12)(10,14,16,15)(17,19)(18,23)(20,32)(21,29)(22,28)(24,41)(25,39)(26,38)(27,34)(30,35)(31,48)(33,46)(36,47)(37,42)(40,43)(44,45)(9,11,13,12)(10,15,16,14)(17,20,21,33)(18,24,25,31)(19,27,29,47)(22,36,35,34)(23,37,39,45)(26,44,43,42)(28,32,30,46)(38,41,40,48)(9,12,13,11)(10,15,16,14)(19,28)(20,33)(22,35)(23,38)(24,31)(26,43)(27,46)(29,30)(32,47)(37,48)(39,40)(41,45)(1,3,4,7)(2,6,5,8)(20,33)(24,31)(27,47)(32,46)(34,36)(37,45)(41,48)(42,44)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.