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