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