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)(11,12)(13,16)(14,15)(18,22)(23,24)(27,31)(28,32) involution — undirected(2,6)(4,7)(9,11,15,16)(10,13,14,12)(17,18)(19,23)(20,24)(21,22)(25,26,29,30)(27,32,31,28)(9,12,15,13)(10,16,14,11)(17,19,21,20)(18,23,22,24)(25,27)(26,28)(29,31)(30,32)(1,3)(2,7)(4,6)(5,8)(9,13,15,12)(10,16,14,11)(17,18)(19,23)(20,24)(21,22)(25,26)(27,28)(29,30)(31,32)(1,4,5,7)(2,8,6,3)(9,14,15,10)(11,13,16,12)(17,20,21,19)(18,23,22,24)(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.