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