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