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