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