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