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