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