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