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