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