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