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