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