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