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