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