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