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