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