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