I did end up getting this to work, but not using an OrgChart call directly. I manually created each card by using a div and giving that div the class of
google-visualization-orgchart-node google-visualization-orgchart-node-small
And setting each div to
display: inline-block
See final code below
google.load('visualization', '1', {packages: ['orgchart']});
google.setOnLoadCallback(drawChart);
function drawChart() {
var s = '<div class="google-visualization-orgchart-node google-visualization-orgchart-node-small" style=\"display: inline-block; padding: 3px; margin: 5px;\">Mike</div><div class="google-visualization-orgchart-node google-visualization-orgchart-node-small" style=\"display: inline-block; padding: 3px; margin: 5px;\">Jim</div><div class="google-visualization-orgchart-node google-visualization-orgchart-node-small" style=\"display: inline-block; padding: 3px; margin: 5px;\">Alice</div><div class="google-visualization-orgchart-node google-visualization-orgchart-node-small" style=\"display: inline-block; padding: 3px; margin: 5px;\">Bob</div><div class="google-visualization-orgchart-node google-visualization-orgchart-node-small" style=\"display: inline-block; padding: 3px; margin: 5px;\">Carol</div';
document.getElementById('chart_div').innerHTML = s;
}
I lost some of the OrgChart functionality, but achieves the look that the project required. Note that the OrgChart code still needs to be downloaded (I require it for other aspects of the project so it was already available.)
See fiddle of finished product http://jsfiddle.net/4eD4u/1/