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