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