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)(11,13,15,16)(17,18,22,26)(19,27,28,40)(20,24,31,38)(21,33,35,25)(23,34,36,30)(29,41,42,48)(32,45,44,39)(37,46,47,43)(1,3,6,2)(4,8,5,7)(9,11)(10,13)(12,15)(14,16)(19,28)(23,36)(27,40)(29,42)(30,34)(37,47)(41,48)(43,46)(11,15)(13,16)(17,19,22,28)(18,23,26,36)(20,29,31,42)(21,34,35,30)(24,37,38,47)(25,40,33,27)(32,46,44,43)(39,48,45,41)(1,4,6,5)(2,7,3,8)(17,20,22,31)(18,24,26,38)(19,29,28,42)(21,32,35,44)(23,37,36,47)(25,39,33,45)(27,41,40,48)(30,43,34,46)(1,5,6,4)(2,7,3,8)(11,15)(13,16)(20,31)(24,38)(29,42)(32,44)(37,47)(39,45)(41,48)(43,46)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.