Web design is hard task. Something which could be shown must be hidden... You can - of course - hide labels by CSS, but they will still in HTML code and Google will hate you. Better way is by PHP snippet in your 'template.php' file:

function NAME_OF_YOUR_THEME_webform_form($form) {
   foreach (element_children($form['submitted']) as $key) {
     unset($form['submitted'][$key]['#title']);
  }

  return drupal_render($form);
}

And all labels are vanished...