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