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