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