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