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