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