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