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