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