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