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