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