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