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