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