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