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