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