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