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)(11,13)(12,14)(15,16)(18,24)(19,26)(21,22)(27,28)(29,30)(31,32) involution — undirected(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,18,22,27,23,28,21,24)(19,25,26,31,29,20,30,32)(1,3,4,7)(2,6,5,8)(11,15)(13,16)(17,19,21,30,23,29,22,26)(18,25,24,32,28,20,27,31)(11,15)(13,16)(17,20)(18,26)(19,24)(21,31)(22,32)(23,25)(27,29)(28,30) involution — undirected(10,14)(13,16)(19,29)(20,25)(26,30)(31,32) involution — undirectedA 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.