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