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