Listing the vertex coordinates (e.g., of an associahedron) is accomplished by
Did you read our tutorials? Please look at
http://www.polymake.org/doku.php/tutorial/coordinates.
Visualizing 3-dimensional unbounded polyhedra works like for ordinary polytopes. However, in four dimensions there is no automatic way (since it is not so obvious what one would like to see, in general). The best thing probably is to explicitly apply a projective transformation via
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$projectively_equivalent_polytope = bound($my_cone);
and then to visualize the polytope as a Schlegel diagram
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$projectively_equivalent_polytope->SCHLEGEL;
Notice that the latter command takes an optional parameter for choosing the facet to project on such as in:
The probably best thing for visualizing an unbounded polyhedron in four dimensions would then be to choose a facet for projection which contains the far face; it's the easiest if the far face
is a facet.
Notice that the combinatorics of a cone is entirely described by the face at infinity. So, in this case, it is best to visualize just this (at most) three-dimensional face.