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)(19,26)(20,24)(21,30)(22,25)(23,28)(27,31)(29,32) involution — undirected(1,3,6,12,7,4,8,15)(2,5,10,9,11,16,14,13)(1,4,7,3)(2,9,11,13)(5,10,16,14)(6,15,8,12)(17,19,21,28,22,29,20,27)(18,23,24,26,25,31,30,32)(1,5,6,9,7,16,8,13)(2,3,10,12,11,4,14,15)(17,20,22,21)(18,24,25,30)(19,27,29,28)(23,26,31,32)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.