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