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