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