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