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