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