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