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