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