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