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