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