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)(33,34)(35,41)(36,39)(37,40)(38,42)(43,47)(44,46)(45,48) involution — undirected(2,6)(4,13)(7,9)(11,16)(17,18,22,20)(19,23,25,26)(21,28,29,24)(27,32,31,30)(33,34,37,40)(35,38,42,41)(36,39,44,46)(43,45,48,47)(2,6)(3,10)(8,12)(11,16)(18,20)(19,25)(24,28)(27,31)(35,42)(36,44)(38,41)(39,46) involution — undirected(1,3)(2,7)(4,11)(5,10)(6,9)(8,14)(12,15)(13,16)(17,19)(18,23)(20,26)(21,27)(22,25)(24,30)(28,32)(29,31)(33,35,37,42)(34,38,40,41)(36,43,44,48)(39,45,46,47)(1,2)(3,7)(4,8)(5,6)(9,10)(11,14)(12,13)(15,16)(17,20,22,18)(19,26,25,23)(21,28,29,24)(27,32,31,30)(33,36,37,44)(34,39,40,46)(35,43,42,48)(38,45,41,47)(1,4,5,13)(2,8,6,12)(3,11,10,16)(7,14,9,15)(17,21,22,29)(18,24,20,28)(19,27,25,31)(23,30,26,32)(33,34)(35,38)(36,39)(37,40)(41,42)(43,45)(44,46)(47,48)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.