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)(19,27,29,24)(21,25,31,36)(22,26,32,37)(28,38,46,39)(30,44,35,40)(33,43,45,41)(34,48,47,42)(1,3,4,8)(2,5,6,7)(10,13)(14,15)(18,23)(19,28)(21,33)(22,32)(24,38)(25,41)(27,39)(29,46)(30,47)(31,45)(34,35)(36,43)(40,42)(44,48)(10,13)(14,15)(17,19,20,29)(18,24,23,27)(21,34,31,47)(22,35,32,30)(25,42,36,48)(26,44,37,40)(28,45,46,33)(38,43,39,41)(2,6)(5,7)(9,11,12,16)(10,14,13,15)(18,23)(24,27)(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.