If you are a Resident of Utah, all your income is reported on your UT return. In the Utah interview, you are asked what amounts of tax you paid to another state, so you are not double-taxed.
You should prepare your California Non-Resident return first, and you may want to check the amounts of State Wages/Tax Withheld on your W-2 to be sure they are split correctly, if they show Income/Tax to both CA and UT.
Generally, if all your work is performed outside CA, you don't need to file a CA return (even if employer is in CA). Here's more info Non-Resident of CA Taxes.
Here's How to File a Non-Resident State Return.
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