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