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