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