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