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