One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,12)(4,8)(5,9)(6,11)(7,13)(10,15)(14,16)(17,18)(19,27)(20,23)(21,25)(22,26)(24,28)(29,31)(30,32) involution — undirected(1,3,6,4)(2,7,11,16)(5,14,15,13)(8,9,12,10)(18,23)(20,21)(24,27)(25,26)(28,30)(31,32)(1,4,6,3)(2,8,11,12)(5,14,15,13)(7,9,16,10)(17,19,22,29)(18,24,26,32)(20,28,21,30)(23,31,25,27)(2,9)(5,15)(7,12)(8,16)(10,11)(13,14)(17,19)(18,24)(20,30)(21,28)(22,29)(23,27)(25,31)(26,32) involution — undirectedA 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.