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