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