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