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