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