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