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