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