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