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