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