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