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