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