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