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