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