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