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