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