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