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