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