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