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