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