Avoid edge intersection in graphviz - graphviz

Question

Suppose we have the following simple graph:
digraph Test {
Start[shape = doublecircle];
Foo[shape = square];
Bar[shape = diamond];
Baz[shape = square];
Xyz[shape = square];
Start -> Foo;
Foo:s -> Bar:n;
Bar:w -> Baz:n;
Bar:e -> Xyz:n;
Baz:s -> Foo:n;
}
Which is rendered as follows:
Is there a way to tell graphviz to draw edge Baz -> Foo without intersections with Foo -> Bar nor Bar -> Baz?

Answer 1

when it comes to graphviz layout, the best you can do is trying as much as possible to not interfere :)
taking out compass_pt from your file:
digraph Test {
Start[shape = doublecircle];
Foo[shape = square];
Bar[shape = diamond];
Baz[shape = square];
Xyz[shape = square];
Start -> Foo;
Foo -> Bar;
Bar -> Baz;
Bar -> Xyz;
Baz -> Foo;
}
and you get:

Answer 2

Adding an invisible node should do the trick:
digraph Test {
Start[shape = doublecircle];
Foo[shape = square];
Bar[shape = diamond];
Baz[shape = square];
Xyz[shape = square];
// "invisible" node to connect baz to foo
BazToFoo [shape=none, label="", height=0, width=0]
Start -> Foo;
Foo:s -> Bar:n;
Bar:w -> Baz:n;
Bar:e -> Xyz:n;
Baz:s -> BazToFoo [dir=none] // remove the arrowhead
BazToFoo -> Foo:n;
}

Answer 3

While I agree with Guy's answer to keep it simple, here's an alternative approach with some changes to eliminate the edge crossings.
digraph Test {
Start[shape = doublecircle, group=a];
Foo[shape = square, group=a];
Bar[shape = diamond, group=a];
Xyz[shape = square];
Baz[shape = square];
Start -> Foo;
Foo:s -> Bar:n;
Bar:e -> Baz:n;
Bar:w -> Xyz:n;
Baz:s -> Foo:n[constraint=false];
}
I found that graphviz's layout doesn't easily route edges back up along the outer left side of a graph. Probably the way the layout algorithm works, allowing the graph to expand to the right and bottom only.
That's why I switched the positions of the bottom nodes, having the node with the returning edge at the right side.