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