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