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