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