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