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