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