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