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