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