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