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