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