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