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