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