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