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)(11,13,15,16)(17,18,22,27)(19,28,30,24)(20,32,33,42)(21,26,23,37)(25,36,41,34)(29,44,46,48)(31,40,35,39)(38,47,43,45)(2,6)(7,8)(9,11)(10,13)(12,15)(14,16)(17,19,22,30)(18,24,27,28)(20,29,33,46)(21,35,23,31)(25,38,41,43)(26,40,37,39)(32,48,42,44)(34,47,36,45)(1,3,5,4)(2,7,6,8)(11,15)(13,16)(17,20,21,36,22,33,23,34)(18,25,37,42,27,41,26,32)(19,29,35,45,30,46,31,47)(24,38,39,44,28,43,40,48)(1,3,5,4)(2,7,6,8)(9,11)(10,13)(12,15)(14,16)(19,30)(20,33)(24,28)(25,41)(31,35)(32,42)(34,36)(39,40)(1,4,5,3)(2,8,6,7)(11,15)(13,16)(17,21,22,23)(18,26,27,37)(19,31,30,35)(20,34,33,36)(24,39,28,40)(25,42,41,32)(29,45,46,47)(38,48,43,44)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.