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