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