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