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