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