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