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