Check out the timewrap app. This will give you a timechart over a 24 hour period with different color lines relative to the day.
Once you download the Splunk timewrap app and install it then restart your Splunk server, you can then pipe your search into timewrap
Below is an example of a timewrap search I run.. You set the timeframe which shows how far you want to go back in time (-2d@d) and you pipe everything into timewrap then put d/w/m/y depending on what units of time you want
index=unleashed Call="CreateOrder" earliest=-2d@d | timechart count by Call | timewrap d