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