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