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