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