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