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