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