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