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