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