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