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