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