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