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