One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,7)(5,6)(9,10)(11,14)(12,15)(13,16)(17,18)(19,26)(20,24)(21,30)(22,25)(23,29)(27,32)(28,31) involution — undirected(2,6)(7,8)(9,11)(10,13)(12,16)(14,15)(17,19,20,28,22,27,21,29)(18,23,30,32,25,31,24,26)(1,3,5,4)(2,7,6,8)(11,16)(13,14)(19,27)(23,31)(26,32)(28,29)(1,4,5,3)(2,7,6,8)(9,11)(10,14)(12,16)(13,15)(19,27)(23,31)(26,32)(28,29)(11,16)(13,14)(17,20,22,21)(18,24,25,30)(19,28,27,29)(23,26,31,32)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.