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