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