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