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