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