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