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