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