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