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