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