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