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