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