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