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