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