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