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