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