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