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