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