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