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