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