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