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