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