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