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