Generally, we try to use the orange the most since that's our main color. When coloring diagrams, I try to keep the routers/clients/devices in monochrome and apply the 4 colors to the connections, because that's where we provide value. I normally use the pink/lime/teal to represent the WAN connections, and the orange in a thicker line to represent SpeedFusion Tunnels.
Same as website, except now there’s blue. The blue exists as a legacy of many past presentations, and can be occasionally used as a secondary color if there’s too much orange on one slide. The pink/orange/lime/teal can be completely removed if you want a more mature/corporate feel to the presentation.