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