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