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