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