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