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