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