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