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