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