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