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