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