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