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