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