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