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