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