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