One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(9,10)(11,14)(12,15)(13,16)(18,23)(19,21)(24,26)(25,31)(27,29)(28,32) involution — undirected(11,12)(14,15)(17,18)(19,23)(20,28)(21,24)(22,26)(25,30)(27,32)(29,31) involution — undirected(1,3,5,4)(2,6,7,8)(9,11,13,12)(10,14,16,15)(17,19,22,21)(18,24,26,23)(20,29,30,27)(25,31,28,32)(9,12,13,11)(10,15,16,14)(17,20)(18,25)(19,27)(21,29)(22,30)(23,31)(24,32)(26,28)(1,4,5,3)(2,6,7,8)(10,16)(14,15)(17,19,22,21)(18,23,26,24)(20,29,30,27)(25,32,28,31)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.