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