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