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