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