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