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)(19,28)(20,25)(21,27)(22,24)(23,26)(29,32)(30,31) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,10)(11,15)(12,14)(13,16)(18,24)(19,29)(25,31)(26,27) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,19,23,25,22,29,21,31)(18,20,27,28,24,30,26,32)(3,8)(5,7)(10,14)(11,16)(17,20,22,30)(18,25,24,31)(19,27,29,26)(21,32,23,28)(2,6)(5,7)(10,14)(13,15)(17,21,22,23)(18,26,24,27)(19,25,29,31)(20,28,30,32)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.