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