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