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