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