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