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