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