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