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