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