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)(18,23)(20,28)(21,27)(22,29)(24,32)(25,31)(26,30) involution — undirected(1,3)(2,8)(4,12)(5,14)(6,13)(7,15)(9,11)(10,16)(17,18)(19,23)(20,24)(21,30)(22,25)(26,27)(28,32)(29,31) 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.