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