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