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