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