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