I also am a big proponent for well drawn schematics.
Go with the flow: left to right and top to bottom. Inputs on the left and outputs on the right.
DON'T try to convert them into "pictorials": use schematic symbols.
And when an IC has multiple circuits, like several amps or digital functions, DON'T insist on keeping them inside one rectangle. Put them where they need to be in the flow of the circuit and tie their physical grouping in one IC package with the component numbers (U3a, U3b, U3c, etc.)
Finally, except for power and ground, keep the use of disconnected tie points to a minimum. DRAW the circuit paths. And use the above "rules" to keep them as short as possible.
A schematic is a way to transmit to the viewer HOW the circuit FUNCTIONS. Not how is will look when assembled or where the various elements are physically grouped into plastic/ceramic packages.
Attached is a schematic made from the pdf trying to be faithful to the original and with my best judgement, it is a sort of pictorial representation.
I don't know anyone who would draw a schematic like that, it's functionally unreadable & unusable IMOP.