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