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