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