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