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