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)(11,14)(12,16)(13,15) involution — undirected(2,6)(7,8)(9,11,13,12)(10,14,15,16)(17,18)(19,27)(20,24)(21,25)(22,26)(23,29)(28,32)(30,31)(1,3,5,4)(2,7,6,8)(10,15)(14,16)(17,19,22,30)(18,23,26,28)(20,31,25,27)(21,32,24,29)(9,12,13,11)(10,16,15,14)(17,20,22,25)(18,24,26,21)(19,28,30,23)(27,32,31,29)(1,4,5,3)(2,8,6,7)(18,25)(20,26)(21,24)(23,27)(28,31)(29,32)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.