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