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