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