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