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