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