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