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