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