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